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  • 1
    Electronic Resource
    Electronic Resource
    Digital GaAs Autocorrelator Developed for Space Borne Submillimeter Astronomy (1998)
    Springer
    Experimental astronomy 8 (1998), S. 239-255 
    Details
    ISSN: 1572-9508
    Keywords: digital processing ; Gallium arsenide ; spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the development of a correlator module intended for space borne high resolution heterodyne spectroscopy. Our attention has been focused on power consumption reduction (few mW per channel needed), while looking for a high clock frequency (few hundreds of MHz) to cover wide bandwidths. The module proposed, which may be the base of an hybrid analog/digital spectrometer, is composed of two full custom Very Low Scale Integration (VLSI) circuits using two different technologies: a high speed MEtal Semiconductor Field Effect Transistor (MESFET) on Gallium Arsenide substrate (GaAs) and a low power Complementary Metal Oxide Semiconductor (CMOS) on Silicon substrate (Si). A 0.8 μm GaAs prototype circuit has been built and tested. It shows a correct global operation up to 242 MHz – and for marginal functions up to 611 MHz –, and a power consumption as expected by the simulations (less than 2 W). Expected improvements of the technology, together with some modifications developed here, demonstrate that a high frequency correlator module, meeting spatial requirements (many hundreds of channels and few mW per resolution point), should be feasible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008081411969
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    First Spectra from a New, Wide Band, Hybrid Digital Correlator Spectrometer for the First-HIFI Instrument (1998)
    Springer
    International journal of infrared and millimeter waves 19 (1998), S. 1471-1487 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have designed and built a new, wide band, modulable resolution spectrometer, in view of full astronomical qualifying tests, and to prepare future models for the FIRST satellite's heterodyne instrument. Our spectrometer, a hybrid digital Autocorrelator, offers flexibility in terms of bandwidth (from 170MHz to 680MHz) and resolution (from 700kHz to 3MHz). This spectrometer required the development of a dedicated analog filter bank, homemade samplers, and the design of full custom GaAs integrated circuits. Laboratory tests have shown excellent agreement with expected performances and observations performed with the IRAM 30-m radiotelescope have qualified its capabilities. Despite the relatively limited number of channels of our current prototype compared to others spectrometers, the main advantages are its stability (inherent to digital technique), and its spectral versatility. Recent microelectronics advances and rad-tolerance of our spectrometer components are used to prepare a new, compact, and low power consumption autocorrelator in view of a flight model for HIFI, the heterodyne instrument on the ESA cornerstone mission FIRST.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022650924654
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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